File do-not-use-snd_pcm_ioplug_hw_avail.patch of Package pipewire

From: Antonio Larrosa <alarrosa@suse.com>
Subject: Fix build with old alsa-devel

Revert part of https://github.com/PipeWire/pipewire/commit/c658574c0119d3a1f199fe17091fc4d5f37f1e71
since the alsa version in SLE/Leap doesn't have a snd_pcm_ioplug_hw_avail function.

Index: pipewire-0.3.5/pipewire-alsa/alsa-plugins/pcm_pipewire.c
===================================================================
--- pipewire-0.3.5.orig/pipewire-alsa/alsa-plugins/pcm_pipewire.c
+++ pipewire-0.3.5/pipewire-alsa/alsa-plugins/pcm_pipewire.c
@@ -192,7 +192,6 @@ snd_pcm_pipewire_process_playback(snd_pc
 	index = 0;
 	avail = maxsize - filled;
 	avail = SPA_MIN(avail, pw->min_avail * bpf);
-	avail = SPA_MIN(avail, *hw_avail * bpf);
 
 	do {
 	offset = index % maxsize;
@@ -236,7 +235,8 @@ snd_pcm_pipewire_process_playback(snd_pc
 			pw->hw_ptr -= pw->boundary;
 		xfer += frames;
 	}
-	*hw_avail -= xfer;
+
+	pcm_poll_unblock_check(io); /* unblock socket for polling if needed */
 
       done:
 	index += nbytes;
@@ -271,7 +271,7 @@ snd_pcm_pipewire_process_record(snd_pcm_
 	d = b->buffer->datas;
 
 	maxsize = d[0].chunk->size;
-	avail = SPA_MIN(maxsize, *hw_avail * bpf);
+	avail = maxsize;
 	index = d[0].chunk->offset;
 
 	do {
@@ -309,7 +309,9 @@ snd_pcm_pipewire_process_record(snd_pcm_
 			pw->hw_ptr -= pw->boundary;
 		xfer += frames;
 	}
-	*hw_avail -= xfer;
+
+	pcm_poll_unblock_check(io); /* unblock socket for polling if needed */
+
 	avail -= nbytes;
 	index += nbytes;
 	} while (avail > 0);
@@ -355,9 +357,6 @@ static void on_stream_process(void *data
 	snd_pcm_pipewire_t *pw = data;
 	snd_pcm_ioplug_t *io = &pw->io;
 	struct pw_buffer *b;
-	snd_pcm_uframes_t hw_avail;
-
-	hw_avail = snd_pcm_ioplug_hw_avail(io, pw->hw_ptr, io->appl_ptr);
 
 	if (pw->drained) {
 		pcm_poll_unblock_check(io); /* unblock socket for polling if needed */
@@ -369,13 +368,13 @@ static void on_stream_process(void *data
 		return;
 
 	if (io->stream == SND_PCM_STREAM_PLAYBACK)
-		snd_pcm_pipewire_process_playback(pw, b, &hw_avail);
+		snd_pcm_pipewire_process_playback(pw, b, 0L);
 	else
-		snd_pcm_pipewire_process_record(pw, b, &hw_avail);
+		snd_pcm_pipewire_process_record(pw, b, 0L);
 
 	pw_stream_queue_buffer(pw->stream, b);
 
-	if (io->state == SND_PCM_STATE_DRAINING && !pw->draining && hw_avail == 0) {
+	if (io->state == SND_PCM_STATE_DRAINING && !pw->draining == 0) {
 		pw_stream_flush(pw->stream, true);
 		pw->draining = true;
 		pw->drained = false;